{"instruction": "You are an expert in event argument extraction. Please extract event arguments and their roles from the input that conform to the schema definition, which already includes event trigger words. If an argument does not exist, return NAN or an empty dictionary. Please respond in the format of a JSON string.", "schema": [{"event_type": "adverse event", "arguments": ["Treatment.Route", "Treatment.Drug", "Subject.Gender", "Combination.Drug", "Subject.Population", "Subject.Race", "Treatment.Time_elapsed", "Treatment.Duration", "Effect", "Subject", "Treatment.Disorder", "Treatment.Freq", "Subject.Age"]}], "input": "We observed ventricular fibrillation in 2 patients who presented to the emergency department with pre-excited atrial fibrillation and were given 12 mg of adenosine."}
{"adverse event": [{"Treatment.Route": "NAN", "Treatment.Drug": "adenosine", "Subject.Gender": "NAN", "Combination.Drug": "NAN", "Subject.Population": "2", "Subject.Race": "NAN", "Treatment.Time_elapsed": "NAN", "Treatment.Duration": "NAN", "Effect": "ventricular fibrillation", "Subject": "2 patients who presented to the emergency department with pre-excited atrial fibrillation", "Treatment.Disorder": "pre-excited atrial fibrillation", "Treatment.Freq": "NAN", "Subject.Age": "NAN"}]}